I would also love a portable body that could do pano stitching work, which the 50mm lens would be OK for, but that requires a large buffer and fast processing times like the SD15 has and the DP3 doesn't.

I don't understand what you are talking about here. The DP3M like the DP2M and DP1M will have a 7 photo (RAW) buffer. Why is this enough. I have not tested but I thought my SD15 had a smaller buffer than that. Besides you can change settings while writing to disc.

For pano work, I really don't understand that DPxM would be limiting you.

Please explain why you think the buffer is too small.

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AF takes away the Zen in photography

Pano stitching, especially hand held, which is what a portable camera is ideal for, depending on the size of the final image and the area covered, can easily require 20-40 shots taken in quick succession to minimize any movement between adjacent shots.

20-40 shots? Wow. Are you bracketing then or you plan to work on a image with 1 to 2 Gb of RAW data?